Antibody found in the gut of rainbow trout

The antibody found in the gut of rainbow trout, known as IgT, is seen here (in green) surrounding a ghost-like trout skin parasite (pink). This immunoglobulin is responsible for gut mucosal immunity. The equivalent antibody in mammals is IgA.
The research was supported by grants from the National Institute of General Medical Sciences and the National Science Foundation.
(Date of Image: 2013)
Credit: Image courtesy of D.G. Atria and J.O. Sunyer, School of Veterinary Medicine, University of Pennsylvania